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What is android:weightSum in android, and how does it work?
...tent"
android:layout_weight="1"
android:layout_width="0dp"/>
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weightSum is useful for having the layout rendered correctly for any device, which will not happen if you set width and height directly.
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Remove leading zeros from a number in Javascript [duplicate]
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We can use four methods for this conversion
parseInt with radix 10
Number Constructor
Unary Plus Operator
Using mathematical functions (subtraction)
const numString = "065";
//parseInt with radix=10
let number = parseInt(numString, 10);
console.log(number);
// Number construc...
Find if current time falls in a time range
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10 Answers
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jQuery: what is the best way to restrict “number”-only input for textboxes? (allow decimal points)
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40 Answers
40
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How to check if element has any children in Javascript?
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or the length property of childNodes:
if (element.childNodes.length > 0) { // Or just `if (element.childNodes.length)`
// It has at least one
}
If you only want to know about child elements (as opposed to text nodes, attribute nodes, etc.) on all modern browsers (and IE8 — in fact, eve...
The tilde operator in C
...he ~ operator is bitwise NOT, it inverts the bits in a binary number:
NOT 011100
= 100011
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Version vs build in Xcode
...d deployment target. The version field is blank and the build field is 3.4.0 (which matches the version of the app from when I was still editing with Xcode 3).
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Learning Regular Expressions [closed]
... It's the same conceptually as the really big character class [-.?+%$A-Za-z0-9...].
Think of character classes as menus: pick just one.
Helpful shortcuts
Using . can save you lots of typing, and there are other shortcuts for common patterns. Say you want to match a digit: one way to write that is...
Drop all duplicate rows across multiple columns in Python Pandas
...ort pandas as pd
df = pd.DataFrame({"A":["foo", "foo", "foo", "bar"], "B":[0,1,1,1], "C":["A","A","B","A"]})
df.drop_duplicates(subset=['A', 'C'], keep=False)
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